At baseline assessment, ten patients had primary amenorrhea and 87 girls secondary amenorrhea. Six girls were not amenorrhoeic but were taking oral contraceptives or had lost more than 20% of their weight and fulfilled the remaining diagnostic criteria for AN. The mean duration of the eating disorder at the time of testing was 15 ± 12 months, ranging from 3 to 60 months and estimated premorbid BMI of the AN patients was 20.4 ± 2.9 (13.5 - 28.7 kg/m2; data available for 98 patients). Before admission, the patients (n = 97) had lost 15 ± 7 (2 - 36) kg. The mean weight on hospital admission (data available for 88 patients; 10 patients were outpatients; missing data, n = 5) was 41.1 ± 6.1 kg.